Audio speaker



FIG. 1 is a front perspective view of the audio speaker showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left side view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines in the drawings depict portions of the audio speaker and form no part of the claimed design. 

CLAIM The ornamental design for an audio speaker, as shown and described. 